PORT 0
PORT 1
10
3
100
Per-Port Functions
2-Port Global Functions
10
100
Management/
Mode Select
Logic & LED
Drivers
Clock
Generator
TX PCS
RX PCS
LEDn
TXENn
MDC
MDIO
DPA_n
DPB_n
Fiber_TPn
REFCLK
PWRDN
Reset
CRSn
100TX
TP
Driver
Management/
Mode Select
Logic & LED
Drivers
Clock
Generator
TX PCS
RX PCS
100TX
TP
Driver
+
+
+
+
+
Management/
Mode Select
Logic & LED
Drivers
Clock
Geerator
TX PCS
RX PCS
TP
Driver
Management/
Mode Select
Logic & LED
Drivers
LXT973 Block Diagram
DPA_n
DPB_n
ADDR
TXERn
RXDVn
RXDn
RXERn
RXCLKn
COLn
TXDn
TXCLKn
Register Set
Management/
Mode Select
Logic & LED
Drivers
Carrier Sense
Data Valid
Error Detect
Management
Counters
Register Set
Port LED
Drivers
Clock
Generator
Pulse
Shaper
Clock
Generator
TX PCS
Serial-to-
Parallel
Converter
Parallel/
Serial
Converter
Manchester
Decoder
Decoder &
Descrambler
Decoder &
Descrambler
Adaptive EQ with BL
Wander Cancellation
Manchester
Decoder
CIM
Auto
Negotiation
Media
Select
RX PCS
100TX
TP
Driver
ECL
Driver
100FX
Slicer
TP/
Fiber In
TP/
Fiber Out
10BT
Intel
LXT973
Low-power, 2-port 10/100 Ethernet Transceiver
With Intel
Carrier Class Ethernet Support
Product Description
The number of high-performance network
applications demanding low power and design
flexibility for Ethernet connectivity are growing rapidly.
Applications that formerly required only single-port
Ethernet connections now require access to multiple
functions or even redundant (fault-tolerant) links.
Cable modems, xDSL modems, IP telephones and
telecom backplanes are just a few of the applications
demanding dual Ethernet connections.
The Intel LXT973 is a dual-port 10/100Mbps
Ethernet PHY transceiver providing a low-power,
feature-rich solution for Ethernet networking.
Expanding the industry-leading Intel portfolio of
single and multi-port PHY solutions, the LXT973
combines reliability and ease-of-use functions such
as auto MDI/MDIX, tolerance to a cable discharge
event (CDE), and long-distance cable support (up to
200m) for more flexibility in "less than optimal" wiring
environments.
Supporting completely independent transceiver
operation, the LXT973 enables the implementation of
fully redundant Ethernet links. Fault tolerance can be
achieved by activating one Ethernet port and leaving
the other port in standby mode in the event of link
failure. Independent operation also allows for
completely separate functions on each link, such as
management information exchange at 10Mbps and
data exchange at 100Mbps. LXT973 provides
maximum flexibility while reducing system complexity
by simplifying board design and component count.
The Intel Advantage
As a leader in Fast Ethernet technology, Intel's
products enable robust systems that are easy to
deploy. The LXT973:
s
Offers the auto MDI/MDIX feature which allows the
device to automatically detect and switch line
pairs. This eliminates the need for cross-over
cables and simplifies LAN installation.
s
Incorporates Intel's advanced circuitry to withstand
cable discharge events (CDEs) caused by static
electricity in the twisted-pair cables.
Intel
Carrier Class Ethernet
Many networking and telecom applications require
high-performance Ethernet components capable of
operating under harsh environmental conditions.
Intel Carrier Class Ethernet products support
operation over the entire extended temperature
range while providing features that increase reliability.
Each device has an operation lifetime of at least 10
years with less than 100 failures per billion hours. All
Intel Carrier Class Ethernet devices will be available a
minimum of 5 years from product introduction.
The Intel Carrier Class Ethernet product portfolio
includes solutions for Ethernet physical layer,
switching and repeater technologies at a variety of
speeds. Intel Carrier Class Ethernet products are
ideal for applications where equipment must function
reliably in uncontrolled environmental conditions such
as base stations, telecom/network switches, factory
floor equipment, and industrial computers.
product brief
Intel
Internet Exchange
Architecture
Low-power, dual-speed network applications including:
s
Building block for telecom backplane systems
s
Internet protocol (IP) telephones
s
Twisted pair (TX) to fiber (FX) converter modules
s
Customer premise equipment (CPE)
Features
Benefits
s
Reduces component count and simplifies design
s
Helps reduce system cost and power
s
Provides system design flexibility
s
Simplifies installation by eliminating the need for cross-over
cables
s
Enables extra information exchange during auto-negotiation
s
Provides fully independent operation for speed and duplex
capability on each port
s
Minimizes board space
s
Enables operation in managed and unmanaged applications
s
Enables use of twisted pair or fiber (via fiber-optic transceiver)
media
s
Provides flexible operation with several generations of
MAC/switch products
s
Provides network design flexibility (longer distances) and
robust operation in installations where cable quality is not
optimal
s
Provides product options for commercial (0C to +70C) and
extended (-40C to +85C) temperature ranges
s
Two independent IEEE 802.3-compliant 10BASE-T
100BASE-TX (FX)10/100 ports
s
Low power consumption--250mW per port typical
s
Independent MII with extended registers for each port
s
Automatic MDI/MDIX
s
Next page exchange
s
Auto-negotiation on each port
s
Integrated termination resistors
s
Device configuration via MDIO port or via external
control pins
s
Fiber support (via Pseudo-ECL) on each port
s
2.5V and 3.3V I/O compatibility
s
All features supported at cable lengths up to 200m
s
Intel Carrier Class Ethernet support
Order Number: 249710-001 Printed in USA/0501/SB
Intel
Internet Exchange Architecture
Copyright 2001 Intel Corporation
Intel Access
Developer's Site
developer.intel.com
Intel Internet Exchange Architecture Home Page
www.intel.com/IXA
Networking Components Home Page
developer.intel.com/design/network
Other Intel Support:
developer.intel.com/design/litcentr
Intel Literature Center
(800) 548-4725 7 a.m. to 7 p.m. CST (U.S. and Canada)
International locations please contact your local sales office.
General Information Hotline
(800) 628-8686 or (916) 356-3104 5 a.m. to 5 p.m. PST
UNITED STATES AND CANADA
Intel Corporation
Robert Noyce Building
2200 Mission College Blvd.
P.O. Box 58119
Santa Clara, CA 95052-8119
USA
EUROPE
Intel Corporation (UK) Ltd.
Pipers Way
Swindon
Wiltshire SN3 1RJ
UK
ASIA-PACIFIC
Intel Semiconductor Ltd.
32/F Two Pacific Place
88 Queensway, Central
Hong Kong, SAR
JAPAN
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Tokodai Tsukuba-shi
300-2635 Ibaraki-ken
Japan
SOUTH AMERICA
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Brazil
Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise,
to any intellectual property rights is granted by this document. Except as provided in Intel's Terms and Conditions of Sale for such
products, Intel assumes no liability whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel
products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent,
copyright, or other intellectual property right. Intel products are not intended for use in medical, life-saving or life-sustaining applications.Intel
may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined."
Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future
changes to them.
* Other names and brands may be claimed as the property of others.
Intel
Internet Exchange Architecture (IXA) is an end-to-end
family of high-performance, flexible and scalable hardware
and software development building blocks designed to
meet the growing performance requirements of today's
networks. Based on programmable silicon and software
building blocks, Intel
IXA solutions enable faster
development, more cost-effective deployment, and future
upgradability of network and communications systems.
Additional information can be found at ww.intel.com/IXA.
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